Bonding & Structure
What type of bond occurs when electrons are shared between nonmetals?
Covalent bond
What is one sign that a chemical change has occurred?
Bubbles, temperature change, color change, formation of a precipitate
What is the number of particles in one mole of a substance?
6.022 x 10²³
What pH range indicates an acidic solution?
below 7
What prefix is used for 3 atoms in a covalent compound?
Tri
What type of bonding involves a “sea of electrons” surrounding metal cations?
Metallic Bonding
What type of reaction involves a hydrocarbon reacting with oxygen to form carbon dioxide and water?
Combustion
How is percent yield calculated?
(Actual yield ÷ Theoretical yield) × 100%
What is the formula to calculate pH from hydronium ion concentration?
pH = -log[H₃O⁺]
What element has atomic number 16?
Sulfur
What term describes a molecule with an uneven distribution of electron density?
Polar molecule
What type of reaction involves two ionic compounds exchanging ions in solution?
Double replacement
What do we call the reactant that is used up first in a chemical reaction?
Limiting reactant
In the reaction HNO₂ + NH₃ → NO₂⁻ + NH₄⁺, which species is the base?
NH3
What is the chemical formula for tetrasulfur hexoxide?
S4O7
What happens to bond angles as the number of lone pairs on a central atom increases?
They decrease
What solid substance may form when two aqueous solutions react?
Precipitate
If 10.5 g of MgCl₂ is produced when 13.2 g was expected, what is the percent yield?
79.5%
What term describes two liquids that can mix evenly in all proportions?
Miscible
What is the name of the compound BrF5?
Bromine pentafluoride
What is the strongest type of intermolecular force?
Hydrogen bonding
What are the products of the reaction: Na₃PO₄ + CaCl₂ → ?
Ca₃(PO₄)₂ + NaCl
What is the volume (in L) of a 1.5 M CaCl₂ solution prepared with 36.0 g of solute?
0.22 L
How much 15 M HCl is needed to prepare 1.0 L of 0.10 M HCl?
0.0067 L or 6.7 mL
Whatis the name of the polyatomic ion with the formula C₂H₃O₂⁻?
Acetate